User Manual

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Siemens Modulating refrigerant valves, PN 63 A6V11160433en / A5W00038735
Building Technologies 2018-07-17
The MVS661..EX refrigerant valve is designed for modulating control of refrigerant
circuits including chillers and heat pumps. It is suitable for use in expansion, hot-gas
and suction throttle applications. In addition to ammonia (R717), the valve can handle
all standard safety refrigerants, noncorrosive gases / liquids and CO
2
(R744). It is not
suited for use with inflammable refrigerants.
Type summary
The refrigeration capacity refers to applications using ammonia.
Product number Item no. DN k
vs
k
vs
reduced Χp
max
Q
0
E Q
0
H Q
0
D
S
NA
P
med
[m
3
/h] [m
3
/h] [MPa]
[kW] [kW] [kW]
[VA] [W]
MVS661.25-016EX S55320-M110
25
0,16 0,10
2,5
95 10 2
22 12
MVS661.25-0.4EX S55320-M111
25
0,40 0,25
245 26 5
MVS661.25-1.0EX S55320-M112
25
1,0 0,63
610 64 12
MVS661.25-2.5EX S55320-M113
25
2,5 1,6
1530 159 29
MVS661.25-6.3EX S55320-M114
25
6,3 4,0
3850 402 74
k
vs
= Nominal flow rate of refrigerant through the fully open valve (H
100
) at a differential pressure
of 100 kPa (1 bar) to VDI 2173
If required k
vs
-value and refrigeration capacity Q
0
can be reduced to 63 %, refer to "k
vs
re-
duction" on page 3
∆p
max
= Maximum permissible differential pressure across the control path A ⇓ AB of the valve,
valid for the entire actuating range of the motorized valve
Q
0
E = Refrigeration capacity in expansion applications
Q
0
H = Refrigeration capacity in hot-gas bypass applications
Q
0
D = Refrigeration capacity in suction throttle applications and ∆p = 0.5 bar
S
NA
= nominal apparent power for selecting the transformer
P
med
= typical power consumption
The pressure drop across evaporator and condenser is assumed to be 0.3 bar each,
and 1.6 bar upstream of the evaporator (e.g. spider).
The capacities specified are based on superheating by 6 K and subcooling by 2 K.
Product number DN k
vs
[m
3
/h]
ASR0.16N 25 0,16
ASR0.4N 25 0,40
ASR1.0N 25 1,0
ASR2.5N 25 2,5
ASR6.3N 25 6,3
The replacement valve insert ASR…N can be used to completely renew the valve when
resizing a plant or after considerable wear and tear.
The valve insert includes mounting instructions, 74 319 0486 0.
The selection software "Refrigeration VASP" calculates the capacity for various refrig-
erants and operating conditions for all three applications. The "Refrigeration VASP"
software selection tool is available from your local Siemens office.
Ordering
Valve body and magnetic actuator form one integral unit and cannot be separated.
Accessories
Valve insert ASR..N
Example:
Product number Stock number Designation
MVS661.25-0.4EX S55320-M111 Ex-certified refrigerant valve